Is it ok for your wife or husband? 1,000 bucks for the winner.?

So I went to her school today and her friends are really loud and one of them mentioned how she tripped and asian dude the other day at school and they all started laughing at her. Would that be considered flirting? Do I have a right to bring it up or should i just ignore it. This isnt the first time something like this has happend. Idk, im thinking of getting a divorce. I feel like she is flirting behind my back. Idky i get pissied off, what should i do? Is it even flirting?